.about-us {
  padding: 60px 20px;
  background: #f9f9f9;
  border-radius: 16px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.06);
  width: 90%;
  margin: 40px auto;
}

/* Section title */
.section-title {
  font-size: 34px;
  margin-bottom: 15px;
  color: #333;
  text-align: center;
}

/* About text */
.about-text {
  font-size: 20px;
  line-height: 1.7;
  color: #555;
  margin-bottom: 30px;
  text-align: justify;
}

/* Subtitle */
.sub-title {
  font-size: 22px;
  margin-bottom: 15px;
  color: #222;
  text-align: center;
}

/* List */
.advantages-grid {
  font-size: 18px;
  line-height: 1.8;
  color: #444;

  margin: 0 auto;
}

/* -------------------------------
   📱 Mobile Responsive
--------------------------------*/
@media (max-width: 600px) {
  .about-us {
    padding: 30px 15px;
    width: 95%;
  }

  .section-title {
    font-size: 22px;
  }

  .about-text {
    font-size: 14px;
    line-height: 1.6;
    text-align: left;
  }

  .sub-title {
    font-size: 18px;
  }

  .advantages {
    font-size: 14px;
    line-height: 1.6;
    padding-left: 15px;
  }

  .advantages li {
    margin-bottom: 10px;
  }
}

/* -------------------------------
   📱💻 Tablet Responsive
--------------------------------*/
@media (min-width: 601px) and (max-width: 900px) {
  .about-us {
    padding: 40px 20px;
    width: 95%;
  }

  .section-title {
    font-size: 24px;
  }

  .about-text {
    font-size: 15px;
  }

  .sub-title {
    font-size: 20px;
  }

  .advantages {
    font-size: 15px;
    line-height: 1.7;
    padding-left: 18px;
  }
}